Most of the essays were pretty decent high-school-level essays that used Zelda mechanics to introduce you to a variety of philosophy textbook topics. The books didn't really pick apart Zelda all that deeply, but it was more of the authors' intention to use Zelda as a springboard into philosophy rather than critique Zelda itself.
For the most part, the essays were pretty good, minus one poorly-researched one which happened to make long-renounced accusations against Nietzsche re: his supposed anti-semitism.

If you are interested in the promise of philosophy and love the Zelda series, I highly recommend this book. If you're already well-versed in philosophy and were hoping for some deep critiques of the series, you will unfortunately have to look elsewhere.